6 things to know before the opening bell

1. Tech vs. President Trump: Shares in Google dropped nearly 1% on Tuesday after President Donald Trump accused the search company of bias.

It’s the latest indication that the tech industry is struggling to avoid being dragged into partisan fights in the United States, where the internet and social networks play a vital role in campaign politics.

Google defended itself, saying in a statement that “search is not used to set a political agenda and we don’t bias our results toward any political ideology.”

Later in the day, Trump accused Google(GOOGL) of “taking advantage of a lot of people.” The president, grouping Google with Facebook(FB) and Twitter(TWTR), said tech companies are “treading on very, very troubled territory and they have to be careful.”

2. Musk on Twitter: Investors in Tesla(TSLA) are keeping a close watch on Elon Musk’s Twitter account again.

The Tesla CEO used the social media network on Tuesday to revive an unfounded accusation about a caver who helped rescue 12 boys and their soccer coach in Thailand.

Musk said it was “strange” that the caver had not sued him after Musk called him a “pedo,” or pedophile, in a tweet in July. Musk had apologized for the tweet.

He also denied that he cried during an interview earlier this month with The New York Times.

Musk announced over the weekend that he was abandoning plans to take the carmaker private. Some analysts have encouraged him to take a break from Twitter and bring in a more disciplined deputy to look after daily operations.